Carburetor air cleaner



Oct. 9, 1951 J. w. WISTOR CARBURETOR AIR CLEANER 2 Sheets-Sheet 1 Filed June 4, 1947 ATTORNEYS Oct. 9, 1951 J. w. WISTOR CARBURETOR AIR CLEANER 2 Sheets-Sheet 2 Filed June 4, 1947 INVENTOR. 1/05 W M ISTUE @4 16:

mN MM ATTDRNEYB Patented Oct. 9,

UNITED STATES PATENT OFFICE CARBURETOR AIR CLEANER Joe W. Wistor, Inyokern, Calif.

Application June 4, 1947, Serial No. 752,341

. 1 Claim.

- 1 r This invention relates to improvements in air cleaners for carburetors of internal combustion engines. A

A object of the invention is to provide an air cleaner of the type wherein the incoming air is drawn through an oil bath before it is permitted to enter the carburetor.

This will remove all impurities from the air, and any that may remain therein will be removed as the air passes through afilter element in the air cleaner.

Another object of the invention'is to provide an air cleaner having an air scoop which is positioned facing toward the radiator, whereby the forward movement of the vehicle on which the Figure 4 is a'sectionalview on the line 4-4 of Figure 1;

Figure 5 is a perspective'view of the casing rying the filter element;

Figure 6 is a perspective view of the air inlet nozzle or distributor;

Figure 7 is a sectional'view on the line 11 of Figure 1 1 Referring more in detail to the drawings, the reference numeral ZU-designates the filter body or housing which is tubular in cross-section and provided on its exterior surface with hanger bracket 2| carrying the hooked bolts 22'whieh' engage the annular curved shoulder 23 of the removable bottom 24. When the wing nuts 25 on the bolts 22 are tightened against the hangers 2|, the shoulder 23 is drawn into engagement with the concave annular seat 26 formed on the outer surface of the body 20 below the hangers 2| above the open bottom edge of the housing.

The housing 20 is closed at the top thereof, and is provided with a gooseneck shaped tubular air inlet 21 which extends downwarly into the housing at one end to terminate at a point slightly above the lower open end of the body.

The opposite end is provided with a forwardly car- 2 extending constricted portion 28 having a, flared mouth or air scoop 29 which is provided at its open end with external threads 30 to receive the ring cap 3| which carries the mesh dust screen 32. A disc shaped filter 33 is retained on the. open end of the air scoop by the cap 3| rearwardly of the screen 32. The screen 32 will prevent large particles of dust, leaves and sticks from entering the scoop 29 while the filter 33 will prevent. smaller particles from entering the scoop 29.; and.v by removing the cap 3!, both the screen 3-2rand filter 33 may be easil cleaned of all particles caught thereon.

As the air enters the portion 28. which tends to speed up the fiow thereof, as well as reduce the pressure thereof, the air is maintained in a relatively straight path by means of thestraightguide vane'33 secured into portion 28 transversely thereof. This vane prevents turbulencev of the air, and,

as itenters the inlet 21, it engages the guidervane 35 secured therein, as is the vane 34 in the POI-n tion 28, and the vane 38 which is also securedin the inlet 21 rearwardly of the vane 35. The lower end of the vane 35 is slightly curved as at 31, while the vane 36 is provided with a curved perforated end 38. The particles not retained by screen 32 and filter 33 will strike the perforated end 38 of the vane 33, and drop or settle against the upper and lower perforated vanes 39 and 4,0.

which are secured to the rearwardly extending: portion 4| on the rear end of the portion.28.. The:

portion 4| has a ring 42 secured at its openend. 43 to engage and support the threaded mouth.

of the collecting bowl 35 which is removable to permit the particles collected therein to be-cleaned therefrom. With the vanes reducing the turbulence of the air, maximum dust removal ismaintained at the entrance of the air to the inlet 21.

This is caused by the abrupt right angular turn made by the superspeeded air as it leaves the portion 28 of the inlet 21, since the heavier dust particles will tend to continue in a straight line below or through the perforated end of the vane 36 to strike the portion M and settle in the collecting bowl 45. This action is caused by one of the basic laws of inertia.

The air leaving the vanes passes through the outlet 21 to emerge from distributor 46 which is provided with the threaded portion 41 which is threaded onto the threaded portion 48 of the inlet 21. The distributor is provided with four depending curved nozzles or outlets 43 which are submerged in the oil bath 50 carried in the bottom 24, and the conical shaped distributor 5| directs the air into the nozzles 49. The nozzles depend below the static level of the 'oil 50. and each nozzle is provided with outlets 52 which are located on a line with the static level of the oil. The bottom 24 carries the anchor bolt 53 which extends upward through the bored guide 54 carried by the bottom 24 to engage the threads in the distributor 51, whereby the bottom is retained in place by the bolt 53 as well as the hooked bolts 22. A cotter key 55 in the threaded end of the bolt 53 prevents the bolt from dropping out of the guide 54 when the bottom 24 is removed, to change the oil 56 therein. The upper end of the guide 54 is provided with projections 56 to indicate the proper level of the oil 50 when it is replaced in the bottom 24.

Threadably mounted on the central portion 48 of the outlet 2'! by means of the adjoining threaded tubular portion 57 therein, is a filter carrying ring shaped casing or housing 58 which is secured to the portion 51 by the ribs 59, and a filtering material 60 is carried by the housing 58. The housing is threaded onto the section 48 until it engages the annular shoulder 61 at the upper end of the portion 48. A spacer washer 62 is then placed on the portion 48 and a second housing 58 is threaded onto the portion 48. A second washer 63 is then placed on the portion 48 and the distributor 46 threaded thereon to firmly hold these elements in place. Half rings 64, Fig. 6, on the distributor 46 and half rings 65 on the housing 20 above the lower open end thereof carry safety chains 66, which prevent the loosening of the distributor 46.

As the air emerges from the oil bath 56, it picks up bubbles and spray, and carries them upwardly into the filtering element 60. The outlets 52 in the distributor nozzles help in starting the flow of air out of the oil, and also aid in producing a finer spray action of the air. The filter 66 carried by the lower housing is of a coarser quality than the filter 60, providing better filtering action, smoother air fiow, as well as permitting more oil bubbles or spray to reach the filter 66. The air thus filtered and cleaned will enter the outlets 6'! to the carburetor.

Secured to the intake 27 above the shoulder 6| is the circular bracket or housing 68 in which is pivotally mounted at 69, the backfire valve 70, Figures 1 and 7, which is retained in closed position against the abutment H in the housing 68 by the spring 72 secured at one end to the hous ing 68, and at the other end to the valve ID. The housing is removable and during a backfire from the carburetor when the pressure caused therebyin the body 20 would increase to a point where the oil 50 would be forced up the inlet 21 where it would accumulate dirt and dust, and result in the erratic action of the cleaner, the valve would open to permit the extra pressure to escape. Thus damage to the cleaner through a backfire would be eliminated.

There has thus been provided an air cleaner of the oil bath type which is a decided improve-' ment over previous types of filters, since it pro-' vides an air scoop for forced air to enter the carburetor and forces the air to pass through an oil bath and be filtered several times before it enters the carburetor.

The elements are easily removed for the clean ing thereof, as well as the replacement of the oil therein.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is:

In an air cleaner, a tubular housing provided with a hanger bracket on its exterior surface,

there being a concave annular seat arranged on the exterior of said housing, a bottom for holding a quantity of oil therein having an annular shoulder thereon seated in said seat, a plurality of bolts extending through said bracket and having hooked ends for: engaging the shoulder on said bottom, an air inlet pipe extending down into said housing and having its lower end spaced above the lower end of said bottom, a distributor provided with a threaded portion arranged in threaded engagement with said inlet pipe, said distributor being provided with a plurality of spaced nozzles extending below the static level of the oil in saidbottom, there being a plurality of spaced openings in each of said nozzles, a guide member arrangedin said bottom, an anchor bolt extending through said guide member and arranged in threaded engagement with said distributor, a pair of filter casings arranged in said housing and threadedly engaging said air inlet pipe, said casing being arranged in superimposed relationabove said distributor, chains extending betweensaid distributor and said housings and connected thereto, a filter'element arranged in each of said casings, the filter element in the lower casing being of a coarser quality than the filter element in the upper casing.

- JOE W. WISTOR.

REFERENCES CITED 7 The following references are of record in the file of this patent:

V UNITED. STATES. PATENTS Glanzer Sept. 16, 1947 

